Deedging appaeatus



(No Model.) A

J. GWYNNE. DREDGING APPARATUS.

No. 534,149. Patented Feb. 12, 1895.

THE NORRlS PETERS 00 movuuwon WASHINGTON, a c.

UNITED [STATES PATENT 7 mos.

JoHNcw NNnor LoNDomENGLAND.

DREDGING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 534,149, dated February12,1895.

: Application filed December 29, 1893.

' To allwhom it may concern:

Belit known that I, JOHNGWYNNE, a subject of the Queen of GreatBritainand Ireland, residing at Hammersmith, London, in the I 5 county ofMiddlesex, England, have'inven'ted Improvements in Dredging Apparatus,of which the following is a specification.

This invention has reference to improvements hereinafter described withreference to the drawings in the construction of what are called mouthpieces forming a portion of dredging apparatus of the kind in whichmaterial such as silt, mud, sand and grave], is raised by means of acurrent of water caused by any suitable means (such as a centrifugalpump) to' pass upward through a pipe to which the mouth piece isapplied.

Referring now to the accompanyingdrawings, Figure 1 shows in verticalsection a mouth piece according to this invention. Fig. 2 shows a planof the same. Figs. 3and 4 are corresponding views of a modification.

As will beseen onreference to Figs. 1 and 2, themouth piece is soconstructed that it and the pipe to which it is applied shall be capableof movement relatively to each other for the purposeof enabling themouthpiece to at all times take a proper bearing on the material to bedredged notwithstanding any variation that may occur from time to timein theangular position of the said pipe with regard to the surface ofthe said material, as for example variations due to the rising andfalling movement (owing to tidal action) ofthe vessel with which the,apparatus is used.

As will be obvious suction pipes and mouth pieces as described can beconstructed in various forms. 1- i In the arrangement shown in Figs.land 2 the mouth piece comprises a tubular piece 1, to which is fixed alug or bracket 2 by means 7 of which and a pivotpin 3, it is hinged orjointed to a corresponding lug or bracket 4 secured to the suction pipe5. The lower end of the suction pipe is bent to a circular form havingthe pivot connecting it to the mouth piece as a center, and the upperend of the mouth piece is similarly bent, these end portions beingfitted telescopically one within the other, as shown, so that when themouth piece has taken a bearing upon the material to be dredged thesuction pipe can move in a serial No. 495.040. (No model.)

vertical plane about the above mentioned pivot pin as a center withoutinterfering with a guide rib carried by the curved portion of thesuction pipe and arranged to work against a grooved guide roller 9mounted within a box 10 fixed to the mouth piece.

When the material to be dredged is in the form of a more or less compactmass,-a casing 11 may advantageously be secured, around the lowerportion of the mouth piece l so as to form therewith a water-tightchamber 12 into which water under pressure is led by a pipe 13 and fromwhich such water is discharged in the form of one or more jets orstreams. In the example shown, the water is discharged in' the form ofjetsthrough a number of nozzles 14 secured to the bottom of ,the'chamber; but it may be discharged through openings otherwise formed, asfor ex: ample through an annular opening at the bottom of the chamber.The nozzles may be made readily detachable so that nozzles of difierentsizes can be used according to re- 8 quirement. When an annular openingis used instead of nozzles, the cross sectional area of such opening maybe made adjustable by any suitable means. Thus the annular open- 1 ingmay be formed between the bottom of the chamber and the conical mouthpiece, and thewater chamber made adjustable on such mouth piece so-thatby moving the one on the other the size of the discharge opening betweenthem can be altered to vary the rate and force of the discharge ofwater. In this way the jet or jets or stream or streams of water act todisintegrate, break up, or loosen the'said material and render itcapable of being readily withdrawn through the suction 10o pipe with thewaterthat is drawn therethrough.

In some cases, as where the material is of a soft nature, the waterchamber and nozzles may be dispensed with as in the modifiedconstruction shown in Figs. 3 and 4. In this construction the lower endof the mouth piece is made of two concentric tubes and serrated to forminlets for the passage of water and material to be dredged, to thesuction pipe. In other respects the construction is similar to theconstruction shown in Figs. 1 and 2.

What I claim is- 1. In dredging apppartus a suction pipe havin g aportion curved to the arc of a circle, provided with a separate mouthpiece similarly curved and arranged telescopically one within the other,and a water tight chamber carried by said mouth piece and having aninlet and an outlet for water under pressure, said suction pipe andmouth piece being hinged or to limit their relative movement, lugs orbrackets and a pivot pin connecting the said suction pipe and mouthpiece, a guide rib on one of the hinged or jointed parts and a guideroller on the other of such parts and against which said rib is arrangedto work substantially as herein described.

3. In dredging apparatus, the telescopically arranged suction pipe 5 andmouth piece with the stops 6 and 7, lugs 2 and 4: and pivot pin 3 theguide rib 8 and guide roller 9 on the pivoted parts, and a water-tightchamber secured to the outer side of said mouth piece and provided withan inlet for water under pressure and discharge nozzles 14 substantiallyas described for the purposes specified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JQHN GWYNNE.

Witnesses:

ARTHUR WOOSNAM,

46 Lincolns Inn Fields, W. O. CH. CASELLA,

89 Cannon St, E. C.

